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Synthesis of the Bi-doped Apatite-type Phases La10-xBixSi6O27 (x= 0.5, and 1)by Hydrothermal Method
Atiek Rostika Noviyanti* , Diana Rakhmawaty Eddy, Annisa Anshari
Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas Padjadjaran Jl. Raya Bandung-Sumedang Km. 21, Jatinangor 45363, Indonesia
*) email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


Lanthanum silicate apatites are attracting due to their considerable interest as an electrolyte of solid oxide fuel cells. In this paper, we reported synthesis of two Bi-doped apatites and one undoped one. Apatite were synthesized by hydrothermal at 200°C for 3 days from La2O3, Na2SiO3, and Bi2O3(for Bi-doped). Le Bail refinement of X-ray data showed that all apatites have a hexagonal cell (P 63/m space group). The lattice parameters of La9.5Bi0.5Si6O27 and La9Bi1Si6O27 are a = b = 9.718(1) Å, c = 7.190(1) Å, and a = b = 9.724(1) Å, c = 7.189(1) Å, r. There is increase in lattice parameters with increasing content of Bi.

Keywords: Lanthanum silicates apatites; oxygen ion conductivities; Bi-doped Apatite; Le Bail refinement; hexagonal cell


Kendrick, E., M.S. Islam, and P.R. Slater, Investigation of the structural changes on Zn doping in the apatite-type oxide ion conductor La9.33Si6O26: A combined neutron diffraction and atomistic simulation study. Solid State Ionics, 2007b. 177(39-40), 3411-3416.

Sansom, J.E.H., et al., Synthesis and structural characterisation of the apatite-type phases La10-xSi6O26+z doped with Ga. Solid State Ionics, 2004, 167(1-2): p. 17-22.


Peer-review under responsibility of Department of Chemistry, Faculty of Mathematics and Natural Sciences, Padjadjaran University.


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